ENG1001 – Lighter, Faster, Stronger - Engineering Assessment Answer

Code: ENG1001 

Engineering Assessment Answer

Assignment Task: ENG1001  Part 1 should be answered as a team. Answers should be given in a separate document to Part 2. 5 marks will be awarded for the clarity and conciseness of your answers. Your participation in the practical sessions and completion of the tensile test pre-quiz will also earn 5 marks. Question 1 - ENG1001  (a) Plot the engineering stress-strain curves obtained by tensile testing the three aluminium specimens. These should be presented together on a single graph. Hint: if using Excel, be sure to select a “XY scatter” rather than a “line” graph, as in some cases a “line” graph does not correctly plot the x values. Question 2 - ENG1001  (a) By generating lines of best fit for the elastic region of the graphs, determine the elastic modulus of the two Al1050 samples that were tested. Show your fitted curves on a new graph. (b) The literature value of the elastic modulus of Al1050 H19 is 70 ± 3 GPa (CES Edupack database). On an atomic scale, what determines the modulus of a material? According to theory would you expect the modulus of the Al1050 O(annealed) sample to be higher, lower or the same as the as-rolled aluminium? What about the Al 6063 sample? (c) Do your measurements of elastic modulus match your predictions and the literature values in Question 2(b)? Describe some of the sources of uncertainty in the measurements of both stress and strain, and comment on how these affect how your modulus measurements should be interpreted Question 3 - ENG1001  What is a dislocation? Describe an edge dislocation with the aid of a diagram showing how the atoms are arranged, and describe how these can be introduced into the metallic lattice. Explain why dislocations are important in determining the mechanical properties of different types of aluminium, and which properties they affect. Explain the effects of cold-working and annealing processes on the number of dislocations in a material, and how this affects the sample mechanical properties. Question 4 - ENG1001  Present a table with the 0.2% proof stress, ultimate tensile strength, uniform elongation and fracture strain for the three materials. Demonstrate how you found these values for the cold rolled sample on a new graph. Al 6063 is an alloy which forms precipitates during heat treatment. Explain how precipitates form, and describe the effect precipitates have on dislocation movement and material strength in aluminium alloys. Question 5 - ENG1001  The yield stress, UTS and ductility (elongation) for Aluminium 1050 H19 and Aluminium 1050 O can be found in Table 1. These correspond to fully work-hardened and annealed aluminium respectively.

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